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Random Boesemani Rainbow deaths

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I had two of these in my community tank, great fish, very active and colorful. One was full grown and the other was just a few months behind it, my water parameters are all in check, haven't changed anything in my water change routine that would shock them, but out of nowhere I came home and one of them is dead... that night I fed the tank, and the larger one is flipping out jumping, swimming erratically, and pretty much in all out freak out mode... two days later he died too.. I can't figure out why?

You have not mentioned your tests and what you get in ammonia, nitrites, nitrates but said "in check". That is rather vague so leaves one to guess they must be 0 ammonia, 0 nitrites and less than 20 nitrates?

Even perfect test results still mean water changes on schedule. The water can be stale, lacking in oxygen and nasty so please add your water change schedule, too. Thanks